Summary of Stock Option Transactions for Shares Under Option and Related Weighted Average Option Price (Detail) (USD $)	12 Months Ended
	Aug. 31, 2011	Aug. 31, 2010
Shares
Beginning Balance	5,500	12,160
Exercised	(5,500)	(6,660)
Ending Balance		5,500
Weighted Average Exercise Price
Beginning Balance	$ 4.74	$ 4.59
Exercised	$ 4.74	$ 4.47
Ending Balance		$ 4.74